> > > I've normally scratched up the surface and soldered them.
> > > Why is there no metal coating on the middle of the disc?
> > > Sounds pretty unusual to me. :o)
> > > -Roman
> >
> > No metal. I've noticed the same thing on the piezos on ultra-
> > sonic tanks.
>
> Joe, if you'll use it for ultrasonic generators you'll have no chance
> with silver paste

Hi Vasile. The U-S tank was just an example, but thanks for
the tip about using a mechanical connection. I expect I'll see
another tank sooner or later

There's definitely no silver backing on these (well, most of
them). It might be aluminium or just plain ceramic that had
a mechanical prong connection

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